What Pacbrake kit do I need for my 2007 T300 w/ 8.3 ISC Cummins--Allison 6 transmission-- Engine has been uprated to 310 HP
Do I need to change any valve springs?
Can you give me a quote for the parts I need to install a Pacbrake? ( Ed Werkhoven, 06/26/2020 )

Our notes indicate that you would need the following parts: C40107, C11591 and C10218. We do not see anything that would require different valve springs, that was only on the older mechanical C8.3L's.

I currently have a jacobs exhaust brake but the actuator had failed, leaks bad and does not activate. All I need is the air actuator not the entire system. Is this something I could get through you? ( Gavin Bitz, 04/12/2020 )

I am not aware of a source for this part. I do not think the PacBrake actuator cylinder would be compatible with the Jacobs exhaust brake either.

What all do I need for my 8.3 cummins ISC CM554 it now has a poor exhaust brake.
Will the valve train take the extra force?
I am in Canada.
Thanks for your time. John
( John Stafford, 06/25/2019 )

Yes the PRXB is designed as a direct replacement, the only engines that require modification to the valve train are the older C8.3 mechanical engines.

Currently have a PACBrake on my ISC. PACBrake serial 098959. Which I am told is a C20384 PACbrake part number. Can I change out this older product with a new PRXB unit without any changes to the engine or transmission programming? ( Jon Tribbey, 05/19/2016 )

Jon,

Yes the PRXB brakes are designed to be direct replacement for the original style and do not require any changes to the engine or transmission.

Would this brake valve fit the C series 8.3L cummins. Truck is an international acco 2350E

( Gavin, 07/18/2015 )

I always advise to contact PacBrake directly for fitment, their phone number is 800-663-0096.